On 3/4/21 6:33 AM, Allan McRae via arch-dev-public wrote: > On 3/3/21 10:54 am, Allan McRae via arch-dev-public wrote: >> On 2/3/21 9:51 pm, Allan McRae wrote: >>> Hi all, >>> >>> A new RFC has been opened here: >>> https://gitlab.archlinux.org/archlinux/rfcs/-/merge_requests/2 >>> >>> Summary: >>> Make -march=x86_64-v2 the default for our packages. This assumes the >>> following instruction sets which are essentially available on all but >>> the oldest AMD CPUs: >>> >>> CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3 >>> >>> Please visit the above link for discussion. > > Lets put discussion on this RFC on hold for a while. Clearly there is a > reasonable amount of objection to making x86-64-v2 the default. While > this mostly appears to be objection based on personal circumstances and > not on the basis of whether this change is good for the distro, I will > work within these limits. > > A lot of comments have suggested adding x86-64-v2 and -v3 as additional > architectures instead. I will revamp the the proposal to take that > approach. Though, to do this automated would require more work it may > be the push we need for a signing enclave to be set up.
For the record -- the RFC has now been revamped. The new form of the proposal is to add a -v3 (skipping right over -v2) additional architecture. ``` Alternatives Considered ----------------------- Moving the baseline to x86-64-v2 was discussed, but the gains were not considered enough to justify removal of support for hardware without SSE4.2. ``` -- Eli Schwartz Bug Wrangler and Trusted User
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